Method and apparatus for making stools for ingot molds



Oct. 1, 1929. 'J. E. PERRY 2 Shuts-Sheet 1 METHOD AND'APPARATUS FQR AKING STOOLS.FOR INGOT HOLDS Filed July 28, 1926 Oct. 1, 1929.

J. E. PERRY METHOD AND APPARATUS FOR MAKING STOOLS FOR INGOT HOLDS z sheets-sheet 2 Filed Jul y 2a. 1926 Jul 4 ATTORNEY which the stools are cast.

Patented Get. 1, 1929 main JOHN E. PERRY, OF SHARON, PENNSYLVANIA, ASSIGNOR TO VALLEY :MO'ULD AND IRON CORPORATION, OF SHARPSVILLE, PENNSYLVANIA, A'GORPORATION OF NEW YORK METHOD AND APPARATUS FOR MAKING STOOLS FOR INGOT HOLDS Application filed July 28,

The present invention relates broadly to metallurgy and more specially to an apparatus and method for casting stools or the like for use with ingot molds. Heretofore in the art, it has been customary to cast stools in sand molds. In casting stools adapted for use with the step type ingot mold, the bottom of which is intended to form a metal to metal oint with the stool, it is essential that exceeding care be exercised to produce on the stool a smooth flat top surface of exact dimensions, particularly where the bevel on the mold fits into the stool. Stools of this type cannot be made commercially in sand molds, which must be thoroughly dried out, because of high cost and the dificulty of making surfaces which are sufficiently true and smooth. It has been found that such surfaces can be satisfactorily obtained by utilizing a very smooth iron chill to form this part of the stool and then casting against the chill. Since the surfaces must be exceedingly smooth, it is necessary to machine the chill member in order to obtain the proper surface. The life of the chill member is limited by the ability of the chill to withstand the action of molten iron. The machining operation is expensive, but where this cost may be spread over a large number of stools, then the expense is not prohibitive.

The present invention contemplates the use of a machined master chill for casting the stool chills to be used in the mold set-up in In accordance with the new method, the master chill is carefully machined to produce the desired smooth surface of the proper dimensions. From this master chill, it is possible to cast a large number of accurate stool chills; then in turn, it is possible to cast a large number of stools from each stool chill, thereby producing a multiple of the number of stools from the single machined master chill. For example, assume that the master chill is carefully machined and ready for use, and that it is possible to cast twenty accurate stool chills from i the master stool, all of which will have very smooth surfaces; and that it is possible to cast twenty good stools from each stool chill. It Will be Observed that a total of four hunl926. Serial No. 125,389.

dred stools of high quality are therefore produced from a single machining operation on the master chill.

Figure 1 is a plan view of a master chill in accordance with the present invention.

Figure 2 is a sectional elevational view on line 2-2 of Figure 1.. I

Figure 3 is a plan view of a stool chill cast from the master chill. I

Figure 4 is an elevational view of the stool chill shown in Figure 3.

' Figure 5 is a plan view of a stool cast from the stool chill.

Figure 6 is an elevational View taken on the section line 6-6 of Figure 5.

It is realized that the present lnvention" may be embodied or carried out in the shapes and forms other than those herewith shown and described and therefore it is to be under stood that the disclosure herewith is illusthe master chill, is machined to produce the v desired configuration on the stool chill.

The master chill A is then set in a mold form in such manner that the surface which has been. machined forms one portion of the matrix of the mold set-up, while the 'rea mainder of the matrix may be the usual sand facing. Then, the stool chill B is cast in the usual way with the backof the stool chill B against a sand mold wall and the face of the stool chill B against the master chill A. This produces a smooth chilled surface 2 on the stool chill B.

The stool chill is set in a castingaset-up for casting the stool C, with the stool chill forming one matrix wall and sand facings forming the other walls of the matrix. The stool C is then cast from molten iron in the usual way. The final result is a stool C having a chilled surface l cast against the stool chill and with the back walls or surfaces of the stool cast against sand mold walls and unchilled. The surface 4 on the stool is very smooth, hard, and of accurate dimen sions. Where desired for use with ingot molds adapted to be bottom poured, the stool may be provided with a pouring opening 5. WVhere the stool is not intended for use with bottom poured ingot molds, then the opening 5 is omitted, and the entire base or bottom of the stool is smooth and chilled.

The chilled face on the stool chill prevents this member from cutting when the molten iron is brought into contact therewith. The chilled face having a close fine grain also produces a good surface on the 'stool and the final result is an accurate stool with a hardened face adapted to withstand the molten steel used to cast the ingot Having thus described my invention, what I claim is 1. lhe art of casting stools for ingot molds comprising casting a master chill: machining said master chill to produce an accurate smooth surface thereon; casting a stool chill against the machined surface on the master chill; and casting one surface of 'a stool against said stool chill and the re ma ning surfaces of said stool against sand walls.

2. The art of manufacturing cast iron stools for ingot molds comprising casting a stool chill against a smooth finished face on a master chill of the size and shape of the desired stool; utilizing the stool chill as one matrix wall and sand walls for the remaining matrix walls; and casting a stool against the stool chill to chill one surface of the stool and to reproduce a surface on the stool which corresponds to the finished face on the master chill and with the remaining surfaces on the stool unchilled.

3. As an article of manufacture, a stool chill comprising a cast iron member adapted to be used as a matrix wall for casting stools and with the matrix surface of said stool chill comprising chilled cast iron, and with the surface opposite to the matrix sur face being unchilled.

l. A master chill comprising an iron casting having a box-like body portion with the bottom of the recess of said box-like pore tion comprising machined areas of the shape and conformation to be given stools generated through the use of said master chills.

JOHN E. PERRY. 

